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凹凸棒石对硫酸亚铁-硝酸钾体系中四氧化三铁结晶作用的影响(英文)
作者:陈天虎 高薇 孙玉兵 庆承松  
单位:合肥工业大学资源与环境工程学院  
关键词:凹凸棒石  磁铁矿  结晶作用  纳米复合材料  热处理 
分类号:O614.811
出版年,卷(期):页码:2008,36(9):1195-1199
DOI:
摘要:

研究了用硫酸亚铁–硝酸钾氧化法在凹凸棒石悬浮液中即时合成磁铁矿制备凹凸棒石–Fe3O4纳米复合材料的可行性以及凹凸棒石对磁铁矿晶体生长控制和影响。X射线粉末衍射、透射电镜、磁化率分析等表征手段的分析结果表明:在制备凹凸棒石负载Fe3O4复合材料的过程中,凹凸棒石投加量和煅烧温度对复合材料的物相组成、形貌特征及磁学性质具有明显的影响。随着凹凸棒石添加量的增加,纳米Fe3O4颗粒变细、粒径分布更均匀。当凹凸棒石煅烧温度超过400℃以后,由于凹凸棒石表面性质的改变,抑制了Fe3O4结晶。

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The feasibility of preparing palygorskite and magnetite composite material in a system of ferrous sulfate and potassium nitrate and the effect of palygorskite on magnetite crystallization were studied. The composite material was characterized with X-ray diffraction, transmission electron microscope and magnetic susceptibility. The results indicate that the amount and calcination tem-perature of palygorskite added in the system of ferrous sulfate-potassium nitrate have an effect on the size, distribution and magnetic properties of magnetite on the surface of palygorskite. The size of nano-magnetite decreases and the crystallite size is distributed more uniformly with the increase of the amount of palygorskite. When the calcination temperature is higher than 400 ℃, no magnetite crystal is formed in the system because the surface characteristics of palygorskite are changed.

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基金项目:
科技部863(2007AA06Z118);; 国家自然科学基金(40772031,50774027)项目资助
作者简介:
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参考文献:

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